THK Ball Spline Series
Ideal for mechanisms that perform linear motion while transmitting torque! Capable of high-speed movement and high-speed rotation!
The ball spline is a revolutionary linear motion system that allows torque transmission while a ball, incorporated into the spline nut, moves smoothly in a straight line along the rolling surface of a precisely ground spline shaft. Moreover, unlike conventional structures, it provides preload with a single spline nut, enabling high performance in harsh applications where vibrational shock loads are present, in areas requiring high precision positioning, and in situations demanding high-speed motion performance. Additionally, when used as a substitute for linear bushes, it has a rated load that is several times greater than that of the same shaft diameter, allowing for a compact design. This makes it usable even in cases where overhang loads and moments are applied, resulting in high safety and long lifespan.
basic information
[Classification of Ball Splines] There are three types of ball splines: high torque type, medium torque type, and rotary type, allowing for selection based on purpose. Additionally, each type offers a variety of spline nut shapes to choose from according to mounting and usage requirements. ▼ High Torque Type ○ Cylindrical Ball Spline (Medium Load Type) LBS Type ○ Cylindrical Ball Spline (Heavy Load Type) LBST Type ○ Flanged Ball Spline LBF Type ○ Flanged Ball Spline LBR Type ○ Square Ball Spline LBH Type ▼ Medium Torque Type ○ Cylindrical Ball Spline LT Type ○ Flanged Ball Spline LF Type ○ Miniature Ball Spline LT-X Type ▼ Rotary Type ○ Rotary Ball Spline LTR-A Type ○ Rotary Ball Spline LTR Type ○ Gear Ball Spline LBG Type ○ Gear Ball Spline LBGT Type
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Detailed information
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High Torque Type "LBS/LBST/LBF/LBR/LBH" [Structure and Features] ○ Six rows of ball columns are arranged to sandwich three protrusions, which are evenly spaced at 120°, on the outer circumference of the spline shaft from both sides, allowing for preloading to be applied smoothly due to the angular contact structure at the ball contact points. ○ Ball circulation occurs within the inner diameter of the spline nut, resulting in a compact outer diameter of the spline nut. ○ There is no angular backlash. ○ It can transmit large torque.
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Medium Torque Type "LT/LF" [Structure and Features] ○ A series of 4 to 6 rows of balls are arranged to sandwich 2 to 3 protrusions on the outer circumference of the spline shaft from both sides, allowing for a pre-load to be applied without difficulty. ○ The two opposing rows of balls have a contact angle of 20°, and by applying an appropriate pre-load, it eliminates angular backlash and achieves proper torque and moment stiffness.
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Rotary Type "LTR-A / LTR / LBG / LBGT" [Structure and Features] ○ LTR/LTR-A is a compact unit type that directly incorporates support bearings into the outer circumference of the spline nut. ○ The LBG/LBGT type features gear processing on the outer circumference of the flange, with radial and thrust needle bearings compactly combined in the spline nut section. This is optimal for torque transmission mechanisms driven by spline nuts.
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Since our establishment in 1987, we have provided various FA equipment tailored to our customers' needs. Now, as a member of the THK group, the world's leading manufacturer of linear motion systems, we have 18 sales locations across Japan, responding quickly and accurately to our customers' requests.